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19 Jun 2008, 22:57
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A swimmer practiced in a still water inlet a river made in its bank, and achieved a speed of 4 km/h. When she was swimming upstream in the river, however, she could only make 3 km/h. One day the swimmer swam into the river from the inlet, then doubled the covered distance going downstream, and finally came back. She averaged 3.8 km/h that day. What was her downstream speed?
A)4
B)5
C)6
D)7
E)8
Can someone help me with the right equations for this question? I get confused reading it.
A)4
B)5
C)6
D)7
E)8
Can someone help me with the right equations for this question? I get confused reading it.
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20 Jun 2008, 00:09
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Ans: 5 approximately
Upstream speed: 3kmph ---given
Let the distance be d and downstream speed be v then according to the Q stem
2d/(d/3 +d/v) = 3.8 => v = 5.1kmph
Upstream speed: 3kmph ---given
Let the distance be d and downstream speed be v then according to the Q stem
2d/(d/3 +d/v) = 3.8 => v = 5.1kmph
